Equations Finding Unknown Number

• 16

• 25

• 20

• 9

12 ÷ ___ = 4

• 2

• 3

• 4

• 6

Find the unknown number.
28= 4 X m
What is m?

• 6

• 7

• 8

• 9

Which equation can you use to help you solve for the unknown number in      48 ÷ ▢ = 6 ?

• 6 x 7 = ▢

• 6 x ▢ = 48

• ▢ x 24 = 48

Which equation can you use to help you solve for the unknown number in                 6 = ▢ ÷ 7 ?

• 6 x 7 = ▢

• ▢ x 6 = 48

• 6 x 12 = ▢

13 + x = 20

What is the value of x?

• 7

• 9

• 8

• 4

Algebra is...

• A fruit

• Something related to mathematics

• A field of mathematics about finding what's missing

• Something I can eat

Algebra is about solving for X

• True

• False

Answer explanation

Advanced algebra is about solving for X, where X is the variable, or unknown value or number.

But X is just a universally agreed letter used in Algebra. In reality, any letter can be a variable.

a + 2 = 4

What does a = ?

• a2

• 2

• 4

• 3

Answer explanation

In this number sentence the letter 'a' is the variable. It's an unknown value.

a + 2 = 4.

Using our knowledge of addition we know that 2 and 2 more equals 4.

So solving for 'a', we rewrite the number sentence to be:

2 + 2 = 4

In the equation 3x = 9, what is the value of x?

• 1

• 2

• 3

Answer explanation

When placed directly to a number, letters become an algebraic expression that tells us 'how many' of the numeral there are.

So, 3x is a simplified expression for 3 + 3 + 3, or three 3s.